thirty definition by Webster's New World
Origin: Late Middle English thirti, metathetic for thritti ; from Old English thritig ; from thri, three plush -tig, -ty
- the cardinal number between twenty-nine and thirty-one; 30; XXX
Origin: prob. orig. telegraphers' code for a concluding sentencethis number used to signify the end of a dispatch, story, etc., as for a newspaper
thirty definition by American Heritage Dictionary
noun pl. thir·ties
- The cardinal number equal to 3 × 10.
- thirtiesa. A decade or the numbers from 30 to 39: They settled down in their thirties. The temperature fell into the thirties.b. often Thirties The decade from 30 to 39 in a century.
- An indication of the end of a news story, usually written 30.
- Sports The second point that is scored by one side in tennis.
Origin: Middle English thritty, thirty, from Old English thrītig; see trei- in Indo-European roots.
- thirˈty adjective & pron.
thirty - Phrases/Idioms